Device for mixing and homogenizing liquids



March 23, 1954 BORCK 2,673,075

DEVICE FOR MIXING AND HOMOGENIZING LIQUIDS Filed Jan. 28,-1952 IN VEN TOR.

Alfr Gerhard Borck BY 4 l p Patented Mar. 23, 1954 DEVICE FOR MIXING AND HOMOGENIZING LIQUIDS Alfred Gerhard Borck, 'I'ullinge, Sweden, assignor to Aktiebolaget Separator, Stockholm, Sweden, a corporation of Sweden Application January 28, 1952, Serial No. 268,520

7 Claims.

This invention relates to the mixing and homogenizing of liquids.

It is known in the art of mixing and homogenizing liquids to make one of the liquids pass at high velocity through a pipe and make the other liquid, which is to be mixed with the first mentioned liquid, flow into this pipe. For this purpose an injection nozzle may be used in which the pressure energy of the first liquid is converted into energy of velocity and in which the centrifugal separator and be used for homogpipes for the other liquid end. Owing to the enizing Who e m k W e t pa mbe s reduced pressure andthe high velocity of the used to pare out skim-milk and to mix and main liquid, the other liquid will be entrained homogenize c e m W t. as disclosed in y and finely distributed within the first liquid. ctr-B d g application Serial NO- 25291, filed This invention is based generally on this known May 9, 1951 now Patent No. 2,612,356, dated principle for mixing and homogenizing of liq- September 30, 1952. In order to obtain the deuids but differs therefrom with regard to the sired high v ci y in the paring b ts way in which the energy of velocity is produced, channels should be constructed in a way which and has for its object the provision of an imbest satisfies this q tproved apparatus for this purpose. For a better understanding of the invention, According to the invention, the device comreference may b d to the accompanying draw. prises a rotatable housing enclosing a paring in W ch member for paring out and discharging, through 1 is a Vertical sectional i w Of a pr a channel therein, a liquid fed into the housferred form f a mixer d homogenizer. ak n ing and rotating with it. When the speed of on the line l-| of Fig. 2, and the housing is sufiiciently high, the liquid (115- Fig. 2 is a horizontal sectional view of the charged by means of a paring member of thi device shown in Fig. 1, with the outer frame type has a velocity which is particularly suittu e mitted. able for mixing it with one or more other liquids The miXer and hcmcgenizer lustrated in the fed, in accordance with the invention, into the d w comprises a fram I the upp part of channel of the paring member or the prolonga- Which is in the form of a shell 2 having a cover. tion of the channel through another channel or A Vertical shaft 5 is rotatably p e in channels. The channel for the other liquid or a bearing 4 n h fr me I- The shaft 5 carries liquids which are to be mixed with the main a housing 6 Provided With a c ve w ich s liquid should preferably end in the channel for secured to the housing 6 by an annular nut 8. In the latter liquid in such a manner that all the the housing 6 is a pari me ber comprising a liquids are discharged in the direction and chanparing disc 9 carried y spindle in, Which i nel of the main liquid, and not vice versa. In tum is supported on the frame I y me ns of order t obtain maximum atomization or an annular nut II screwed on the spindle l0 and, mogenizationy a Separate homogenizing device secured to the cover 3 of the frame by bolts (not may be provided in the discharge channel f shown). In the housing 6 and on the lower side the liquids, at a point where the velocity of the Q? the cover 1 are Wings 12 and I3, respectively, liquid is sumoiently high This Somme homog directed radially inward and serving the purenizing device may be in the form of a chamber pose of maklllg the liquid fed into h housing filled with balls or the like, as disclosed in Borck B partake in its rotation The Wings 12 support et a1. Patent No. 2,583,206 dated January 22,1952. an annular flange the function 9 which will According to one particular embodiment of this be pres ently- In the spmdle and invention, the homogenizing device is placed in the parmg 9 15 a central through-flow chanthe paring member. The latter may consist of endmg a the bottom of the paljmg a circular disc in the circumference of which the Thls Channel 15 surrounded (foncentrlcauy by opening or openings of the parin cha l are another channel l6, from which extend three 1ooated The channels may also end in the smaller channels or ducts II in the paring disc. g m l housing in t form of tubes projecting Each duct ll ends in one of three channels I8 from the paring member. In some cases it may in t Daring d e- T e chan els I8 extend as be preferable to use a paring disc of external far as the circular periphery of the paring disc.

spiral shape consisting of a disc having one or more projections in which the openings of the paring channel or channels are located.

The advantage of a mixer of this type is the high velocity which is given to the main liquid.

The velocity energy is composed of static pressure converted into energy of this type and of the kinetic energy of the rotating liquid. The mixer may also advantageously be built into a where they end in bent tubes l9 fixed to the paring disc. As shown in Fig. 2, the bent portion of each tube 19 extends opposite to the direction of rotation of the housing 6. The other ends of the channels 18 open each into a chamber 20 in the paring disc. An homogenizing device 2|, which may consist of a chamber filled with balls or the like (as disclosed the aforesaid Patent No. 2,583,206), is arranged between each chamber 20 and channel l8. The chambers 211" have a common outlet through the spindle It via. the channel 22.

The construction described operates in the following manner. After the housing 6: has: been: put into rotation by means" of a driving device (not shown) coupled to the shaft 5, a liquid which is to be mixed with another liquid is: admitted. through the channel [5, which forms a liquid inlet to the housing. The liquid is distributed on the lower side of the paring disc 9 into the channels: formed by the annular flange M the: wings I2, and. the bottom wall of the housing, and is immediately put into rotation and led to the periphery of the paring disc. The a rows in the drawing indicate the direction in which the liquids move. The bent tubes is oi the paring. disc pare out the liquid to which, owing to the static pressure prevailing at the point of. paring and. the kinetic energy of the liquid, a considerable amount of. energy is givenmakes itpossiblefor the liquidv to be mixed. with the other liquid at; high velocity in the channels i8, which should be suitably shaped for the purpose; and then toflow with only small loss otenergy into the homogenizing member- 24 andv thence into the chamber 20. The other liquid. which is to be mixed with the first isat: the same time admitted through the channel l6 and the ducts it, communicating with the channels I 8. The second liquid is finely di strihuted into the" first or main. liquid and iollows: it to the homogenizing member 2! and chamber 20. The ducts ll end in such away in the channels In that suchflow is made possible, and the pared-out liquid is prevented from-- flowing out-through the ducts H.v Thus, each channel f8; in the region: where it is joined by the duct IT, may be reduced in through-flow area soas to effect an increase in velocity and a reduction in. pressure oil the main liquid. whereby the ac-- tion is. similar. to that of an injection nozzle. When the liquids-. are brought. together in the channel [8}. an. intimate mixing is obtained and, to acertain degree,, homogenizing. of the liquids: is brought about, which: is further improved in the homogenizing member 21. The mixed. and homogenized liquid-I is discharged-from the chamber 20 through the channel 22. v

From the above, it will be understood that the homogenizing devices 21- are not necessary for the mixing of the liquids but are provided only for. the purpose of. improving the mixing. The homogenizing devices 21 may be arranged cut side the paring disc at a point beyond thechannel 22 reckoned in the direction of. flow. Neither is itnec'essary tor the ducts I! tolie in the paring.

disc 9 itself, but they may very well be positioned beyond the channel 22 if care is taken that the liquid flowing through channel 22 has still a sufiiciently high velocity to effect a mixing with the other liquid when it is made to converge with it. Instead of a paring disc having projecting tubes IS, a circular paring disc without such tubes maybe used, although the energy produced with the same diameter of the inlet openings will then be a little lower. Instead of tubes projecting from the paring disc, a paring disc provided with peripherally spiral-shaped projections in which the channels [8 end, may be used,. as disclosed the aforesaid Brecourt et al.

PatentNo': 2,230,219

mam:

l. A liquid mixing device comprising a rotatable housing having a liquid inlet and adapted to rotate a body of liquid fed through the inlet, a paring member in the housing operable on said liquid body to pare. and discharge: liquid therefrom, the paring member-having a channel for passage ofthe pared liquid at high velocity, and aliquid supply ductterminating in said channel at a. region spaced fromits entrance end and where the. throughi'iow area of the channel doesnot exceed the throughflow area at said entranceend of the channel for supplying tothe channel. a liquid to be mixed with said first liquid while said first liquid is at high velocity..

2. A device according to claim 1, in which said. channel and duct form an injection. nozzle in which said first liquidv entrains: thesecond, liquid in the direction andv channel of the first liquid.

3. A device according to claim 1-.,. comprising also an homogenizing device disposed in said. channel beyond the point. of its intersection withsaid. duct, reckoned in the direction ofliquid. fio-w in. the channel.

4. A device according to claim 1,. inwhich said duct. is in the paring. memben.

5. A device according. to claim 1 comprising also an homogenizing device disposed in the par: ing member and located. in said channel beyond the point. of its intersection.- with saidduct, reekcried in the direction of liquid flow in the chah nel.

6. A deviceaccording to claimv 1 in which the paring member comprises a: paring. dischaving a. circular circumference, said channel having let openings in said circumference ofv the disc.

7. A. device according to claim 1,v in which theparing member comprises a. paring. disc having a circular circumference and a tube forming. an

,, extension. projecting beyond saidcircumference UNITED STATES PATENTS Number v Nance Date 1,866,638 Fawcett. July 12, 1932- 2,171,136 Bergner -2 Aug. 29, 1939 2,230,210 Brecour et al. Jan. 28, 194-1. 2,3l8-,293 Cornell May 4,. 19.43 2,546,745 Hein Mar. 27,,- I951 

